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1. WO1997044372 - ESTERS VINYLIQUES DURCISSABLES AUX U.V. ET A INDICE DE REFRACTION ELEVE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS
1. A cross-linkable polymeric casting composition including an effective amount of
a divinyl ester monomer of a bicyclic or polycyclic compound; and optionally a minor amount of
a di- or polythio compound.
2. A cross-linkable polymeric casting composition according to claim 1 wherein the divinyl ester monomer is a divinyl ester of an alkoxylated bisphenol C or bisphenol S, or mixtures thereof.
3. A cross-linkable polymeric casting composition according to claim 1 wherein the divinyl ester monomer is selected from compounds having the formula I



wherein
G is selected from the group consisting of




o
M is selected from the group consisting of a bond, — S— , — S —
methylene and — CH2 — S — CH2 — • o
Ry, R2, R3 and R4 which may be the same or different, are selected from the group consisting of hydrogen and alkyl of 1 to 6 carbon atoms,
n is an integer having a value of 0 to 10,
Y is hydrogen or a halogen; and
J is an unsaturated terminal group selected from allyl and the group of o
— C— C=CH

formula R where R5 is hydrogen or C, to C6 allyl.
4. A cross-linkable polymeric casting composition according to claim 3 wherein in said compounds of formula I the group G is naphthalene or provides a bisphenol S or bisphenol fluorene derivative and Y is selected from the group consisting of hydrogen, fluorine, chlorine and bromine.
5. A cross-linkable polymeric casting composition according to claim 1 wherein the divinyl ester monomer comprises one or more monomers selected from the group consisting of
an ethoxylated bisphenol S divinyl ester of the formula


a naphthalene-based ethoxylated divinyl ester of the formula

(II)
a bisphenol fluorene diglycidyl allylic monomer of the formula
OH OH

I I

CH2=CHCH20-CH2-CH-CH2— 0-CH2— CH-CH2— OCH2CH=CH2



and
a bisphenol S diallyl ether of the formula


(VI)
6. A cross-linkable coating composition according to claim 1 wherein the divinyl ester monomer is present in amounts of from about 5 to about 80% by weight.
7. A cross-linkable casting composition according to claim 6 wherein the divinyl ester is present in an amount of about 10 to about 70% by weight.
8. A cross-linkable casting composition according to claim 1 wherein the di-or polythiol compound is present and is selected from the group consisting of di-, tri- and tetra polythiol compounds.
9. A cross-linkable casting composition according to claim 8 wherein the di-or polythiol compound comprises one or more compounds selected from the group consisting of: Pentaerythritol Tetrakis (3-mercapto-propionate) [PTMP], Trimethylolpropane Tris (3-mercaptopropionate) [TTMP], 4-mercaptomethyl-3,6-dithia-1 ,8-octanedithiol [MDO], Pentaerythritol Tetrakis (3-mercaptoacetate) [PTMA], Trimethylolpropane Tris (3-mercaptoacetate) [TTMA], 4-t-butyl-1 ,2-benzenedithiol, 2-mercaptoethylsulfide, 4,4'-thiodibenzenethiol, benzenedithiol, Glycol Dimercaptoacetate, Glycol Dimercaptopropionate Ethylene bid(3-Mercaptopropionate), Polyethylene Glycol Dimercaptoacetates, Polyethylene Glycol Di(3-Mercaptopropionates), 2,5-bis(mercaptomethyl)-1 ,4-dithiane and 3,6-dithia-1 ,8-octamedithiol.
10. A cross-linkable coating composition according to claim 1 wherein the thiol compound is present in amounts of from about 5 to about 30% by weight of the total casting composition.
11. A cross-linkable casting composition according to claim 1 further comprising strain reducing agent.
12. A cross-linkable casting composition according to claim 11 wherein the strain reducing agent is present in an amount sufficient to decrease the cure time.

13. A cross-linkable casting composition according to claim 11 wherein the strain reducing agent comprises one or more compounds selected from the group consisting of. Epoxidised soybean oil, Propylene Oxide, Hexanediol diglycidyl ether (HDGE), 1 ,2 epoxy butane, Bisphenol fluorene diglycidyl ether (BPGE), Epolight 100MF, AG-601 and MY721.
14. A cross-linkable casting composition according to claim 11 wherein the secondary epoxidised monomer is present in amounts of from approximately

0.001% to 2.5% by weight based on the total weight of the casting composition.

15. A cross-linkable casting composition according to claim 1 further comprising one or more polymerisable comonomer selected from the group consisting of vinyls, allylics, polyoxyalkylene glycol di-, tri-, tetra- and higher acrylates or meth acrylates, polymerisable bisphenol monomers capable of forming a homopolymer having a high refractive index of more than 1.55, urethane monomers having 2 to 6 terminal acrylic or methacrylic groups, fluorene diacrylates or dimethacrylates, and thiodiacrylate or dimethacrylate monomers.

16. A cross-linkable casting composition according to claim 1 further comprising a polymerisation initiator selected from ultraviolet (U.V.) cationic or radical initiators.
17. A cross-linkable casting composition according to claim 16 wherein the initiator comprises one or more compounds selected from the group consisting of: 2,4,6-trimethylbenzoyldiphenylphosphine oxide, (2-methyl-1 -[4-(methylthio) phenyl]-2-morpholinopropane-1-one), (hydroxycyclohexyl) phenyl ketone, (2-benzyl-2-N-dimethylamino-1-(4-morpholinophenyl)-1-butanone), (Benzyl Dimethyl Ketal), 2-(carbamoylazo)-substituted, 2-n-propoxy-9H-thioxanthen-9-one and Ethyl 4-(dimethylamino)benzoate.
18. An optical article prepared from the casting composition of claim 1.
19. An optical article according to claim 18 having a refractive index of at least approximately 1.55.
20. An optical article according to claim 18 having a refractive index of at least 1.57.
21. An optical article according to claim 18 having a density in the range of about 1.15 to 1.25g cm-3.